How do you determine how much stearic acid to add?
by Lisa From Wisconsin
Hi Cathy...Thank you so much for answering everyone's questions. :)
I have been learning a lot! Thanks Again. Now It's my turn for a question......or 2. :)
I have been making CP soap for about 3 years now. I haven't strayed too... far from my comfort zone. I have recently purchased some stearic acid. Made 4 batches by adding .5 oz per # of soap. (I haven't found a lot of info on how much to add except .5oz per lb. or 1 Tbl per lb.)How much is too much SA?
I added SA to 4 separate recipes and each one acted about the same except for one which had a little more "soft" oils. (Traced slower.)
I am wanting to up the hardness of my shampoo bar. I am using less "soft" oils in my recipe as to keep the bar harder and longer lasting as I can. Now my question is when using the soapcalc Which qualities should I be watching? Hardness,,Linolenic?
If my recipe right now is say at a hardness of 30 and I want to up that to say 40 would there be any other indications of hardness of the bar? when I up the "soft" oils then 30 drops down. do I add enough SA to raise it back to 30 or 40. That also seams like a lot of SA. Or is that what I need to do?
Am I wrong in thinking that...If more "soft" oils are used in a recipe, then I could use way more SA to make a hard bar of shampoo?
How do I know when I have reached a good hardness for my shampoo recipe?
OK I am confused. Lol.Answer:
Look for Lauric, Myristic, Palmitic and Strearic acids in the oils you want to use. These acids all lend hardness to a soap bar formula.
Remember that a shampoo bar tends to have larger quantities of castor oil in it so you will find that a shampoo bar is often a bit softer than your regular soap formula. That softeness is a trade off we make in order to have that lovely fluffy lather.
Adding in stearic acid will certainly harden up the bar but I wouldn't go too crazy with it since it may be sensitizing in larger quantities.
Beeswax might be another option you could use to harden your shampoo as well.